EP0374428B1 - Compacting screen for a road finisher - Google Patents
Compacting screen for a road finisher Download PDFInfo
- Publication number
- EP0374428B1 EP0374428B1 EP89119795A EP89119795A EP0374428B1 EP 0374428 B1 EP0374428 B1 EP 0374428B1 EP 89119795 A EP89119795 A EP 89119795A EP 89119795 A EP89119795 A EP 89119795A EP 0374428 B1 EP0374428 B1 EP 0374428B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tamping
- screen according
- baseplate
- compacting
- underside
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000000463 material Substances 0.000 claims description 11
- 230000005284 excitation Effects 0.000 claims 1
- 230000010355 oscillation Effects 0.000 claims 1
- 230000003534 oscillatory effect Effects 0.000 claims 1
- 239000011435 rock Substances 0.000 claims 1
- 238000005056 compaction Methods 0.000 description 40
- 230000006835 compression Effects 0.000 description 19
- 238000007906 compression Methods 0.000 description 19
- 239000004566 building material Substances 0.000 description 12
- 238000009434 installation Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000009499 grossing Methods 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000009420 retrofitting Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/22—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for consolidating or finishing laid-down unset materials
- E01C19/30—Tamping or vibrating apparatus other than rollers ; Devices for ramming individual paving elements
- E01C19/34—Power-driven rammers or tampers, e.g. air-hammer impacted shoes for ramming stone-sett paving; Hand-actuated ramming or tamping machines, e.g. tampers with manually hoisted dropping weight
- E01C19/40—Power-driven rammers or tampers, e.g. air-hammer impacted shoes for ramming stone-sett paving; Hand-actuated ramming or tamping machines, e.g. tampers with manually hoisted dropping weight adapted to impart a smooth finish to the paving, e.g. tamping or vibrating finishers
- E01C19/407—Power-driven rammers or tampers, e.g. air-hammer impacted shoes for ramming stone-sett paving; Hand-actuated ramming or tamping machines, e.g. tampers with manually hoisted dropping weight adapted to impart a smooth finish to the paving, e.g. tamping or vibrating finishers with elements or parts partly or fully immersed in or penetrating into the material to act thereon, e.g. immersed vibrators or vibrating parts, kneading tampers, spaders
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/48—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ
- E01C19/4833—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ with tamping or vibrating means for consolidating or finishing, e.g. immersed vibrators, with or without non-vibratory or non-percussive pressing or smoothing means
Definitions
- the invention relates to a (in practice sometimes referred to as "screed") screed for a (pavement) paver for paving and compacting fresh road building material (such as asphalt) according to the preamble of claim 1 preferably a compaction screed with a main screed, the working width of which can be changed by means of adjustable screeds that can be extended laterally.
- Compaction screeds for such (road surface) pavers which have a base plate lying flat on the building material to be compacted during the compaction operation and (at least) a ramming unit with a strip-shaped ramming element which extends transversely to the direction of travel, the periodically oscillating driven ramming element (which is sometimes referred to as "knife”) compresses the building material to be compacted due to an impressed movement and the base plate (due to the weight force exerted on it) also contributes to the compacting, in particular, meanwhile, a (surface) smoothing of the laid building material.
- This generic compaction screed according to DE 32 09 989 A 1 or DE 31 14 049 C 3 is not a ramming unit with respect to the second compaction device, but rather a compaction device (already known from US Pat. No. 3,614,916) with a so-called pressure bar with which (only) swelling pressure impulses are to be introduced into the paving material, which are generated by means of a vibration generator or exciter.
- the second compression device arranged downstream of the first base plate or its (second) compression element only results in a lower compression than theoretically provided due to the periodic swelling pulses introduced into the installation material, it obviously does not occur that the second compression element downstream second base plate rests on the top of the installation material, so that it cannot be effective (smoothing) at all, and it can even happen that the underside of the second compression element (which extends downward beyond the underside of the base plate) inevitably rests on the pre-compacted installation material, which means that even the first base plate does not lie on its rear section at all on the top of the installation material pre-compressed by the ramming unit arranged in front of it, because the base plates are in the frame n the compaction screed has a structurally provided fixed relative position to each other, and this also applies to the second compaction device (and thus its compaction element), which - as stated - in contrast to a tamping element of a tamper unit, which performs a considerable stroke during the compaction operation, only
- the present invention has for its object to improve a compaction screed of the type described in the preamble of claim 1 with a safe high post-compaction or final compaction, in particular with regard to its drive mechanism.
- a preferred embodiment is that the lever arms connected to the ramming elements are of different lengths in order to be able to generate different ramming forces on the ramming elements, a preferred embodiment consisting in that the lever arm acting on the rear ramming element is shorter than that with the front ramming element connected lever arm.
- the (tamper) stroke of the tamping element and / or its tamping frequency can preferably be changed in order to adjust the compaction screed according to the invention to different To be able to adjust conditions (especially layers of paving material of different thicknesses)
- the tamper drive only has a working cylinder (preferably designed as a hydraulic cylinder) like a vibration exciter, undesirable, uncontrollable additions or cancellations of the generated vibrations do not occur in the two-arm lever-drive configuration described above, because the vibrations generated by the Compression operation - due to the lever arms of different lengths - results in a difference in vibration mass resulting in vibration amplitudes which act as a uniform vibration on the base plate (s) (in particular the front first base plate), which means that a separate vibration drive (at least) for the front first base plate can also be omitted.
- a working cylinder preferably designed as a hydraulic cylinder
- the tamper drive can have a rotatingly driven eccentric, which acts on the lever (or the tamper) via a connecting rod, it also having proven to be expedient for adaptation purposes if the eccentricity of the eccentric can be changed to change the tamper stroke.
- At least a portion of the front first base plate can be lowered (and of course lockable in intermediate positions) in a controlled manner down to the level of the underside of the second base plate in order to reduce the height difference to the rear second base plate, this measure in particular for different layer thicknesses of paving material is appropriate.
- a drop which can preferably take place in that the front first base plate is pivotally mounted about a pivot axis running transversely to the direction of travel, the stroke of the downstream one second ramming element can be rendered ineffective, for example, by lowering the underside of the front first base plate to the level of the rear second base plate, so that the downstream second ramming element no longer protrudes downward over both levels during its operation.
- Such a pivoting, metered adjustment of the front first base plate can preferably take place by means of an adjustment device with a worm drive, although other adjustment devices such as a stepping motor, an adjustment screw, spindle or the like can obviously also be provided.
- the radial distance of the front edge of the front first base plate pointing in the direction of travel of the paver to the pivot axis is smaller than the distance of the rear edge of the first base plate facing the rear second base plate, so that the rear edge can be lowered by a Adjustment of the inclination of the first base plate to make the downstream second tamper ineffective, in whole or in part.
- the ramming elements are preferably beveled in a manner known per se on their lower front edges pointing in the direction of travel, the beveling of the front first ramming element being able to have a larger angle to the horizontal than the beveling of the rear second ramming element, for example 45 ° / 30 °.
- a retrofitting of conventional pavers with the compaction screed according to the invention and a replacement of a compaction screed for repair purposes is achieved according to a development of the present invention in that the front first base plate and the ramming units form an exchangeable structural unit.
- the first base plate 2 is immediately preceded by a ramming unit 5 which effects a pre-compaction and has a strip-shaped tamping element 5 'which extends transversely to the direction of travel 4 and which periodically moves with its underside 23 during the compaction operation to the level 24 of the underside 25 of the first base plate 2 is.
- the first base plate 2 is immediately followed by a second tamping unit which brings about a compaction and has a strip-shaped (second) ramming element 6 'which also extends transversely to the direction of travel 4.
- the two ramming elements 5 ', 6' each have bevels 5a or 6a on their front (bottom), the bevel 5a of the first ramming element 5 'lying in the direction of travel 4 not being as steep in relation to the horizontal as the bevel 6a of the first base plate 2 immediately downstream second ramming element 6 '.
- the two ramming elements 5 ', 6' are connected to one another via a two-armed (rocker) lever 7, which is pivotally mounted about an axis of rotation 8.
- the lever arm 7a on which the ramming element 5 'arranged in the direction of travel 4 is arranged, is longer than the lever arm 7b, on which the ramming element 6' is arranged, so that the two ramming units 5, 6 are different Exercise ramming forces.
- the compression bar 1 is pivotable about a pivot axis 11 in the direction of arrow 12, i. H. can be lowered with its section facing the ramming unit 6 and thus its inclination adjustable.
- FIG. 2 shows an enlarged partial representation of the representation according to FIG. 1.
- the compaction screed 1 ' has a so-called main screed 13 which, in order to adjust / adjust the working width, has four adjustment beams which can be extended laterally and which also form components of the compaction screed 1', the main screed 13 and the adjustable screeds to be arranged in room 14, which are not shown in the drawing, are basically constructed in the same way.
- FIG. 1 it is indicated by dashed lines 2a that the front first base plate 2 can be adjusted in its inclination about the pivot axis 11.
- a spindle 17 is provided for adjusting the compression bar 1 - and thus the front first base plate 2.
- Fig. 1 is also indicated by dashed lines how the ramming elements 5 ', 6' move about the pivot axis 8, the ramming units 5, 6 or their ramming elements 5 ', 6' are driven by an eccentric shaft 16, which via a connecting rod 15 is connected to the tab 9 of the lever 7.
- the tamping element 6 ′ of the second tamper unit 6 has an underside 26 over the underside 25 of the first base plate 2 Downwardly protruding second base plate 18 is immediately arranged during the compression operation on the building material which is re-compressed by the ramming element 6 'of the second ramming unit 6. It can also be seen from FIG. 1 that the second ramming element 6 'in its upward and downward movement reaches down to the working surface of the rear second base plate 18 which is in engagement with the building material 3.
- the inclination of the front first base plate 2 is also adjustable such that its rear area can be lowered to the level of the working surface of the rear second base plate 18.
- FIG. 3 shows a variant compared to the exemplary embodiment according to FIG. 1, an adjusting screed 14 ′ being provided in addition to the main screed 13.
- the embodiment of the main screed 13 according to FIG. 3 differs from the embodiment according to FIG. 1 only by another adjustment device for the compression bar 1, which in this embodiment has a working cylinder 19 instead of a spindle 17.
- FIG. 4 shows a section through the compaction screed according to FIG. 3 in the direction of the section line IV-IV in FIG. 3, but only one half of the main screed 13. On the left side of FIG. 3 there is the center of the main screed 13; here the main screed 13 actually continues to the left.
- the main screed 13 could in principle be of any previously described or similar configuration, a main screed 13 according to FIG. 3 being shown here.
- eccentric shaft 16 and the tab 9 of the lever 7 are constructed. It can be seen in particular that the eccentric shaft 16 is eccentric in the area in which it is encompassed by the connecting rod 15, and that in addition to this predetermined eccentricity there is the eccentricity of a bearing shell 21 which surrounds the eccentric shaft 16 in this area . This bearing shell 21 can be rotated coaxially about the eccentric shaft 16. The set eccentricity is fixed with a disk 22.
- the eccentricities of the eccentric shaft 16 and the bearing shell 21 add or subtract, so that the eccentric formed by the eccentric shaft 16 and the bearing shell 21, which is encompassed by the eye of the connecting rod 15, its eccentricity can be changed, a change in this eccentricity causing a change in the tamper stroke of the ramming units 5, 6 or their ramming elements 5 ', 6'.
- a clutch 23 ' is indicated in FIG. 4, through which the eccentric shaft 16 is driven in an actively rotating manner.
- FIG. 5 finally shows a further (third) exemplary embodiment of a compaction screed 1 'according to the invention, which is distinguished from the exemplary embodiments described above by a modified embodiment of its adjusting device, the adjusting device in FIG. 5 being an oil motor 20 with a worm gear shows.
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Paving Machines (AREA)
Description
Die Erfindung betrifft eine (in der Praxis hin und wieder auch als "Einbaubohle" bezeichnete) Verdichtungsbohle für einen (Straßendecken-)Fertiger zum Einbauen und Verdichten von frischem Straßenbaustoff (wie z. B. Asphalt) nach dem Oberbegriff des Anspruches 1, und zwar bevorzugt eine Verdichtungsbohle mit einer Hauptbohle, deren Arbeitsbreite durch seitlich ausfahrbare Verstellbohlen veränderbar ist.The invention relates to a (in practice sometimes referred to as "screed") screed for a (pavement) paver for paving and compacting fresh road building material (such as asphalt) according to the preamble of
Es sind Verdichtungsbohlen für derartige (Straßendecken-) Fertiger bekannt, die eine während des Verdichtungsbetriebes flächig auf dem zu verdichtenden Baustoff aufliegende Bodenplatte sowie (wenigstens) ein Stampferaggregat mit einem sich quer zur Fahrtrichtung erstreckenden, leistenförmigen Stampfelement aufweisen, wobei das periodisch oszillierend angetriebene Stampfelement (welches hin und wieder auch als "Messer" bezeichnet wird) den zu verdichtenden Baustoff aufgrund einer eingeprägten Bewegung verdichtet und die Bodenplatte (aufgrund der auf sie ausgeübten Gewichtskraft) ebenfalls zur Verdichtung beiträgt, insbesondere indes eine (Oberflächen-)Glättung des verlegten Baustoffes bewirkt.Compaction screeds for such (road surface) pavers are known which have a base plate lying flat on the building material to be compacted during the compaction operation and (at least) a ramming unit with a strip-shaped ramming element which extends transversely to the direction of travel, the periodically oscillating driven ramming element ( which is sometimes referred to as "knife") compresses the building material to be compacted due to an impressed movement and the base plate (due to the weight force exerted on it) also contributes to the compacting, in particular, meanwhile, a (surface) smoothing of the laid building material.
Da es erstrebenswert ist, eine möglichst hohe Verdichtung des verlegten Baustoffes zu erzielen, um zu verhindern, daß dieser sich später beim Befahren (insbesondere partiell) absenkt, sind bereits verschiedene Maßnahmen vorgeschlagen worden, um eine solche hohe Verdichtung zu erzielen.Since it is desirable to achieve as high a compaction of the laid building material as possible in order to prevent it from lowering (in particular partially) later when driving on it, various measures have already been proposed in order to achieve such a high compaction.
So ist es bspw. aus der DE 33 00 092 A 1 bekannt, zur Erreichung des vorgenannten Ziels ein Stampferaggregat vorzusehen, welches zwei zusammenwirkende Stampfelemente (mit einer gemeinsamen Exzenterlagerung) aufweist, die in Fahrtrichtung vor dem Bohlenkörper angeordnet sind. Bei dieser bekannten Verdichtungsbohle kommt es zwar aufgrund der zwei Stampfelemente zu einer höheren Verdichtung als bei einer Verdichtungsbohle, die nur ein einziges Stampfelement aufweist, doch hat es sich gezeigt, daß die dem Gegenstand der vorgenannten Druckschrift zugrundeliegende Aufgabe, eine derartige Verdichtungsbohle zu schaffen, die eine anschließende Nachverdichtung des Einbaumaterials erübrigt, mit dieser vorbekannten Verdichtungsbohle nicht zu lösen ist, daß also auch bei Einsatz einer derartigen Verdichtungsbohle regelmäßig ein anschließendes Endfinishen mittels einer Walze od. dgl. unentbehrlich ist.It is known, for example from DE 33 00 092 A1, to provide a ramming unit which has two interacting ramming elements (with a common eccentric bearing) which are arranged in front of the screed body in the direction of travel in order to achieve the aforementioned goal. In this known compaction screed there is a higher compaction due to the two ramming elements than in the case of a compaction screed which has only a single ramming element, but it has been shown that the object on which the above-mentioned document is based to create such a compaction screed which a subsequent post-compaction of the paving material is not necessary, which cannot be solved with this previously known compaction screed, so that a subsequent final finishing by means of a roller or the like is regularly indispensable even when such a compaction screed is used.
So hat es sich bspw. gezeigt, daß es bei zwei unmittelbar nebeneinander angeordneten Stampfelementen im Arbeitsbereich des zweiten Stampfelementes (statt eines Verdichtungseffektes) zu einer Art Saugeffekt kommen kann, bei dem insbesondere die Fein- und Flüssiganteile des Baustoffes hochgesaugt (statt verdichtet) werden, und es kann überdies auch zu einem Losrütteln des bereits von dem ersten Stampfelement verdichteten Straßenbaustoffes kommen.It has been shown, for example, that with two ramming elements arranged directly next to one another in the working area of the second ramming element (instead of a compression effect), a kind of suction effect can occur, in which in particular the fine and liquid components of the building material are sucked up (instead of compressed), and, moreover, the road building material already compacted by the first tamping element can be shaken loose.
Es ist daher mit der DE 32 09 989 A 1 (bzw. dem zugehörigen Hauptpatent gemäß DE 31 14 049 C 3) auch bereits eine gattungsgemäße Verdichtungsbohle vorgeschlagen worden, deren (erster) Bodenplatte - in Fahrtrichtung des Fertigers - in konventioneller Weise ein Stampferaggregat mit einem sich quer zur Fahrtrichtung erstreckenden, leistenförmigen Stampfelements unmittelbar vorgeordnet worden ist, welches während des Verdichtungsbetriebes mit seiner Unterseite periodisch bis auf das (Höhen-)Niveau der Unterseite der (unmittelbar nachfolgenden ersten) Bodenplatte zu bewegen ist, wobei darüber hinaus eine eine Nachverdichtung bewirkende zweite Verdichtungseinrichtung mit einem sich ebenfalls quer zur Fahrtrichtung des Fertigers erstreckenden, leistenförmigen (zweiten) Verdichtungselement unmittelbar nachgeordnet ist, welcher eine mit ihrer Unterseite über die Unterseite der ersten Bodenplatte nach unten vorstehende, während des Verdichtungsbetriebes auf dem von dem Verdichtungselement der zweiten Verdichtungseinrichtung nachverdichteten Baustoff aufliegende zweite Bodenplatte unmittelbar nachgeordnet ist.DE 32 09 989 A 1 (or the associated main patent according to DE 31 14 049 C 3) has therefore already proposed a generic compaction screed, the (first) base plate of which - in the direction of travel of the paver - has a ramming unit in a conventional manner a strip-shaped ramming element extending transversely to the direction of travel has been placed directly upstream, which during the compression operation periodically moves its underside up to the (height) level of the underside of the (immediately following first) base plate, with a compaction effecting in addition a second compacting device with a strip-shaped (second) compacting element, which also extends transversely to the direction of travel of the paver, is arranged directly behind it, which protrudes downward with its underside over the underside of the first base plate, during the compacting operation on the compactor ement of the second compaction device, post-compacted building material, is immediately arranged on the second base plate.
Bei dieser gattungsgemäßen Verdichtungsbohle gemäß der DE 32 09 989 A 1 bzw. DE 31 14 049 C 3 handelt es sich bzgl. der zweiten Verdichtungseinrichtung indes nicht um ein Stampferaggregat, sondern um eine (bereits aus der US-PS 36 14 916 bekannte) Verdichtungseinrichtung mit einer sog. Preßleiste, mit welcher (lediglich) schwellende Druckimpulse in das Einbaumaterial einzuleiten sind, die mittels eines Schwingungserzeugers bzw. -erregers erzeugt werden.This generic compaction screed according to DE 32 09 989 A 1 or DE 31 14 049
Dabei ist man davon ausgegangen, daß man mittels einer solchen, der ersten Bodenplatte (unmittelbar) nachgeordneten (Vibrations-)Preßleiste während des (Verdichtungs-)Betriebes tatsächlich zu einer vorgegebenen Verdichtung kommt, deren "geometrisches Ausmaß" so groß ist wie der Niveauunterschied zwischen der Unterseite der ersten Bodenplatte und der Unterseite der zweiten Bodenplatte. Dieses ist - je nach den jeweiligen Verhältnissen des konkreten Einsatzfalles - indes mitnichten regelmäßig der Fall. Kommt es nun aber durch die der ersten Bodenplatte nachgeordnete zweite Verdichtungseinrichtung bzw. deren (zweites) Verdichtungselement lediglich aufgrund der in das Einbaumaterial eingeleiteten periodischen Schwellimpulse zu einer geringeren Verdichtung als theoretisch vorgesehen, so kommt es ersichtlich überhaupt nicht dazu, daß die dem zweiten Verdichtungselement nachgeordnete zweite Bodenplatte auf der Oberseite des Einbaumaterials aufliegt, so daß sie überhaupt nicht (glättend) wirksam werden kann, und es kann sogar dazu kommen, daß der Umstand, daß die Unterseite des zweiten Verdichtungselementes (welches sich nach unten über die Unterseite der Bodenplatte hinauserstreckt) zwangsnotwendigerweise auf dem vorverdichteten Einbaumaterial aufliegt, dazu führt, daß selbst die erste Bodenplatte an ihrem rückwärtigen Abschnitt gar nicht auf der Oberseite des von dem vor ihr angeordneten Stampferaggregat vorverdichteten Einbaumaterials aufliegt, weil die Bodenplatten im Rahmen der Verdichtungsbohle eine konstruktiv vorgesehene feste Relativstellung zueinander haben, und dieses auch für die zweite Verdichtungseinrichtung (und damit deren Verdichtungselement) gilt, welche - wie ausgeführt - im Gegensatz zu einem Stampfelement eines Stampferaggregates, welches während des Verdichtungsbetriebes einen beachtlichen Hub ausführt, lediglich im Rahmen seiner Vibration minimalen Schwingungsbewegungen unterworfen ist, die lediglich einen geringen Bruchteil des höhenmäßigen Stufensprungs zwischen erster und zweiter Bodenplatte und damit auch zwischen der ersten Bodenplatte und der Unterseite des als Preßleiste ausgebildeten (zweiten) Verdichtungselementes der der ersten Bodenplatte nachgeordneten zweiten Verdichtungseinrichtung ausmachen.It has been assumed that such a (vibration) pressure strip, which is (directly) arranged after the first base plate, actually results in a predetermined compression during (compression) operation, the "geometric dimension" of which is as large as the level difference between the bottom of the first base plate and the underside of the second base plate. Depending on the respective circumstances of the specific application, this is by no means the case on a regular basis. If, however, the second compression device arranged downstream of the first base plate or its (second) compression element only results in a lower compression than theoretically provided due to the periodic swelling pulses introduced into the installation material, it obviously does not occur that the second compression element downstream second base plate rests on the top of the installation material, so that it cannot be effective (smoothing) at all, and it can even happen that the underside of the second compression element (which extends downward beyond the underside of the base plate) inevitably rests on the pre-compacted installation material, which means that even the first base plate does not lie on its rear section at all on the top of the installation material pre-compressed by the ramming unit arranged in front of it, because the base plates are in the frame n the compaction screed has a structurally provided fixed relative position to each other, and this also applies to the second compaction device (and thus its compaction element), which - as stated - in contrast to a tamping element of a tamper unit, which performs a considerable stroke during the compaction operation, only in Within the scope of its vibration, it is subjected to minimal vibratory movements, which only make up a small fraction of the height increment between the first and second base plate and thus also between the first base plate and the underside of the (second) compression element designed as a pressure bar of the second compression device arranged downstream of the first base plate.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Verdichtungsbohle der im Oberbegriff des Anspruches 1 beschrieben Gattung bei einer sicheren hohen Nach- bzw. Endverdichtung insbesondere bezüglich ihres Antriebs mechanismus zu verbessern.The present invention has for its object to improve a compaction screed of the type described in the preamble of
Die vorstehende Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale des Anspruches 1 gelöst. Bevorzugte Ausgestaltungen sind in den Unteransprüchen beschrieben.The above object is achieved according to the invention by the characterizing features of
Diesbezüglich sei darauf verwiesen, daß die Merkmale der Ansprüche 2 und 3, wonach die Stampfelemente im Gegentakt angetrieben werden bzw. die Stampfaggregate (bzw. deren Stampfelemente) antriebsmäßig miteinander gekoppelt sind, gemäß der US-A-1 644 511 für eine Maschine zur Fertigung einer Betonfahrbahn an sich bekannt sind.In this regard, it should be pointed out that the features of
Eine bevorzugte Ausgestaltung besteht darin, daß die mit den Stampfelementen verbundenen Hebelarme unterschiedlich lang sind, um auf diese Weise an den Stampfelementen unterschiedliche Stampfkräfte erzeugen zu können, wobei eine bevorzugte Ausgestaltung darin besteht, daß der am hinteren Stampfelement angreifende Hebelarm kürzer ist als der mit dem vorderen Stampfelement verbundene Hebelarm.A preferred embodiment is that the lever arms connected to the ramming elements are of different lengths in order to be able to generate different ramming forces on the ramming elements, a preferred embodiment consisting in that the lever arm acting on the rear ramming element is shorter than that with the front ramming element connected lever arm.
Überdies ist bevorzugt der (Stampfer-)Hub des Stampfelementes und/oder deren Stampffrequenz veränderbar, um die erfindungsgemäße Verdichtungsbohle auf unterschiedliche Verhältnisse (insbesondere unterschiedlich dicke Lagen von Einbaumaterial) einstellen zu können.In addition, the (tamper) stroke of the tamping element and / or its tamping frequency can preferably be changed in order to adjust the compaction screed according to the invention to different To be able to adjust conditions (especially layers of paving material of different thicknesses)
Wenn der Stampferantrieb gemäß einer bevorzugten Ausgestaltung einen (vorzugsweise als Hydraulikzylinder ausgebildeten) Arbeitszylinder nur wie einen Schwingungserreger aufweist, kommt es bei der oben beschriebenen zweiarmigen Hebel-Antriebs-Ausgestaltung nicht zu unerwünschten, unkontrollierbaren Additionen oder Aufhebungen der erzeugten Schwingungen, weil sich durch die beim Verdichtungsbetrieb - wegen der unterschiedlich langen Hebelarme - ergebende Schwingmassendifferenz Schwingungsamplituden ergeben, die sich als gleichförmige Vibration auf die Bodenplatte(n) (insbesondere die vordere erste Bodenplatte) auswirken, wodurch auch ein gesonderter Vibrationsantrieb (zumindest) für die vordere erste Bodenplatte entfallen kann.If, according to a preferred embodiment, the tamper drive only has a working cylinder (preferably designed as a hydraulic cylinder) like a vibration exciter, undesirable, uncontrollable additions or cancellations of the generated vibrations do not occur in the two-arm lever-drive configuration described above, because the vibrations generated by the Compression operation - due to the lever arms of different lengths - results in a difference in vibration mass resulting in vibration amplitudes which act as a uniform vibration on the base plate (s) (in particular the front first base plate), which means that a separate vibration drive (at least) for the front first base plate can also be omitted.
Gemäß einer anderen Ausgestaltung kann der Stampferantrieb einen rotierend angetriebenen Exzenter aufweisen, der über ein Pleuel auf den Hebel (oder die Stampfer) einwirkt, wobei es sich ebenfalls zu Anpassungszwecken als zweckmäßig erwiesen hat, wenn die Exzentrizität des Exzenters zur Veränderung des Stampferhubes veränderbar ist.According to another embodiment, the tamper drive can have a rotatingly driven eccentric, which acts on the lever (or the tamper) via a connecting rod, it also having proven to be expedient for adaptation purposes if the eccentricity of the eccentric can be changed to change the tamper stroke.
Gemäß einer weiteren höchst bevorzugten Ausgestaltung der vorliegenden Erfindung kann wenigstens ein Abschnitt der vorderen ersten Bodenplatte zur Verkleinerung der Höhendifferenz zur hinteren zweiten Bodenplatte gesteuert bis auf das Niveau der Unterseite der zweiten Bodenplatte absenkbar (und selbstverständlich in Zwischenstellungen arretierbar) sein, wobei diese Maßnahme insbesondere für unterschiedliche Schichtdicken von Einbaumaterial zweckmäßig ist. Durch ein solches Absinken, welches bevorzugt dadurch erfolgen kann, daß die vordere erste Bodenplatte um eine quer zur Fahrtrichtung verlaufende Schwenkachse schwenkbar gelagert ist, kann der Hub des nachgeordneten zweiten Stampfelementes bspw. dadurch unwirksam gemacht werden, daß die Unterseite der vorderen ersten Bodenplatte bis auf das Niveau der hinteren zweiten Bodenplatte abgesenkt wird, so daß das nachgeordnete zweite Stampfelement während seines Betriebes über beide Niveaus nicht mehr nach unten hervortritt.According to a further highly preferred embodiment of the present invention, at least a portion of the front first base plate can be lowered (and of course lockable in intermediate positions) in a controlled manner down to the level of the underside of the second base plate in order to reduce the height difference to the rear second base plate, this measure in particular for different layer thicknesses of paving material is appropriate. Such a drop, which can preferably take place in that the front first base plate is pivotally mounted about a pivot axis running transversely to the direction of travel, the stroke of the downstream one second ramming element can be rendered ineffective, for example, by lowering the underside of the front first base plate to the level of the rear second base plate, so that the downstream second ramming element no longer protrudes downward over both levels during its operation.
Eine wie vorstehend bereits angeordnete Verstellung der Neigung der vorderen ersten Bodenplatte hat - gegenüber einem vertikalen Absenken - den Vorteil, daß ein besserer Übergang vom vorderen ersten Stampfelement auf das Niveau der Arbeitsfläche (= Unterseite) der hinteren zweiten Bodenplatte zu erreichen ist. Dabei kann ein solches verschwenkendes dosiertes Verstellen der vorderen ersten Bodenplatte bevorzugt durch eine Verstelleinrichtung mit einem Schneckentrieb erfolgen, wobei indes ersichtlich auch andere Verstelleinrichtungen wie ein Schrittmotor, eine Verstellschraube, Spindel od. dgl. vorgesehen sein können.An adjustment of the inclination of the front first base plate, as already arranged above, has the advantage over vertical lowering that a better transition from the front first tamping element to the level of the working surface (= underside) of the rear second base plate can be achieved. Such a pivoting, metered adjustment of the front first base plate can preferably take place by means of an adjustment device with a worm drive, although other adjustment devices such as a stepping motor, an adjustment screw, spindle or the like can obviously also be provided.
Gemäß einer weiteren bevorzugten Ausgestaltung der vorliegenden Erfindung ist der radiale Abstand der in Fahrtrichtung des Fertigers weisenden Vorderkante der vorderen ersten Bodenplatte zur Schwenkachse kleiner als der Abstand der zur hinteren zweiten Bodenplatte weisenden Hinterkante der ersten Bodenplatte, so daß die Hinterkante absenkbar ist, um durch eine Neigungsverstellung der ersten Bodenplatte den nachgeordneten zweiten Stampfer ggf. ganz oder teilweise unwirksam machen zu können.According to a further preferred embodiment of the present invention, the radial distance of the front edge of the front first base plate pointing in the direction of travel of the paver to the pivot axis is smaller than the distance of the rear edge of the first base plate facing the rear second base plate, so that the rear edge can be lowered by a Adjustment of the inclination of the first base plate to make the downstream second tamper ineffective, in whole or in part.
Die Stampfelemente sind in an sich bekannter Weise bevorzugt an ihren in Fahrtrichtung weisenden unteren Vorderkanten angeschrägt, wobei die Anschrägung des vorderen ersten Stampfelementes einen größeren Winkel zur Horizontalen aufweisen kann als die Anschrägung des hinteren zweiten Stampfelementes, bspw. 45°/30°.The ramming elements are preferably beveled in a manner known per se on their lower front edges pointing in the direction of travel, the beveling of the front first ramming element being able to have a larger angle to the horizontal than the beveling of the rear second ramming element, for example 45 ° / 30 °.
Ein Nachrüsten herkömmlicher Fertiger mit der erfindungsgemäßen Verdichtungsbohle sowie ein Auswechseln einer Verdichtungsbohle zu Reparaturzwecken wird gemäß einer Weiterbildung der vorliegenden Erfindung dadurch erreicht, daß die vordere erste Bodenplatte und die Stampfaggregate eine austauschbare Baueinheit bilden.A retrofitting of conventional pavers with the compaction screed according to the invention and a replacement of a compaction screed for repair purposes is achieved according to a development of the present invention in that the front first base plate and the ramming units form an exchangeable structural unit.
Die Erfindung ist nachstehend an Ausführungsbeispielen unter Bezugnahme auf eine Zeichnung weiter erläutert.The invention is explained below using exemplary embodiments with reference to a drawing.
Es zeigt:
- Fig. 1
- einen Vertikalschnitt durch eine erfindungsgemäße Verdichtungsbohle;
- Fig. 2
- einen Ausschnitt aus der Darstellung gemäß Fig. 1 in vergrößerter Darstellung;
- Fig. 3
- einen Vertikalschnitt durch ein weiteres Ausführungsbeispiel einer erfindungsgemäßen Verdichtungsbohle;
- Fig. 4
- einen Schnitt durch das Ausführungsbeispiel gemäß Fig. 3 in Richtung der Schnittlinie IV-IV gesehen; und
- Fig. 5
- einen Vertikalschnitt durch ein weiteres Ausführungsbeispiel einer erfindungsgemäßen Verdichtungsbohle.
- Fig. 1
- a vertical section through a compaction screed according to the invention;
- Fig. 2
- a section of the illustration of Figure 1 in an enlarged view.
- Fig. 3
- a vertical section through a further embodiment of a compaction screed according to the invention;
- Fig. 4
- seen a section through the embodiment of FIG 3 in the direction of section line IV-IV. and
- Fig. 5
- a vertical section through a further embodiment of a screed according to the invention.
Fig. 1 zeigt einen Vertikalschnitt durch eine Verdichtungsbohle 1' mit einem Verdichtungsbalken 1, der eine - in Fahrtrichtung 4 vornliegende - vordere erste Bodenplatte 2 aufweist, die während des Betriebes flächig auf dem Baustoff (= Einbaumaterial) aufliegt und auf dieses einwirkt (s. Fig. 2).Fig. 1 shows a vertical section through a compaction screed 1 'with a
Der ersten Bodenplatte 2 ist ein eine Vorverdichtung bewirkendes Stampferaggregat 5 mit einem sich quer zur Fahrtrichtung 4 erstreckenden, leistenförmigen Stampfelement 5' unmittelbar vorgeordnet, welches während des Verdichtungsbetriebes mit seiner Unterseite 23 periodisch bis auf das Niveau 24 der Unterseite 25 der ersten Bodenplatte 2 zu bewegen ist.The
Der ersten Bodenplatte 2 ist ein eine Nachverdichtung bewirkendes zweites Stampferaggregat mit einem sich ebenfalls quer zur Fahrtrichtung 4 erstreckenden, leistenförmigen (zweiten) Stampfelement 6' unmittelbar nachgeordnet. Die beiden Stampfelemente 5', 6' weisen jeweils an ihrer Vorderseite (unten) Anschrägungen 5a bzw. 6a auf, wobei die Anschrägung 5a des in Fahrtrichtung 4 vornliegenden ersten Stampfelementes 5' in Relation zur Horizontalen nicht so steil ist wie die Anschrägung 6a des der ersten Bodenplatte 2 unmittelbar nachgeordneten zweiten Stampfelementes 6'.The
Die beiden Stampfelemente 5', 6' sind über einen zweiarmigen (Kipp-)Hebel 7 miteinander verbunden, der um eine Drehachse 8 schwenkbar gelagert ist. Der in der Zeichnung der besseren Übersicht halber nicht dargestellte Antrieb für die Stampfaggregate 5, 6 bzw. deren Stampfelemente 5', 6' greift an einer Lasche 9 an, so daß die beiden Stampfelemente 5', 6' periodisch oszillierend zu einer Auf- und Abwärtsbewegung angetrieben werden, wenn der Hebel 7 um seine Schwenkachse 8 hin- und herkippt.The two ramming elements 5 ', 6' are connected to one another via a two-armed (rocker)
Der Hebelarm 7a, an dem das in Fahrtrichtung 4 vorn angeordnete Stampfelement 5' angeordnet ist, ist länger als der Hebelarm 7b, an dem das Stampfelement 6' angeordnet ist, so daß die beiden Stampfaggregate 5, 6 unterschiedliche Stampfkräfte ausüben.The
Der Verdichtungsbalken 1 ist um eine Schwenkachse 11 in Richtung des Pfeiles 12 schwenkbar, d. h. mit seinem dem Stampfaggregat 6 zugewandten Abschnitt absenkbar und somit in seiner Neigung einstellbar.The
Die vorstehenden Darlegungen sind insbesondere aus Fig. 2 erkennbar, die eine vergrößerte Teildarstellung der Darstellung gemäß Fig. 1 zeigt.The above explanations can be seen in particular from FIG. 2, which shows an enlarged partial representation of the representation according to FIG. 1.
Wie aus Fig. 1 erkennbar ist, weist die Verdichtungsbohle 1' eine sog. Hauptbohle 13 auf, die zur Verstellung/Einstellung der Arbeitsbreite außer dem Raum 14 vier seitlich ausfahrbare Verstellbohlen aufweist, welche ebenfalls Bestandteile der Verdichtungsbohle 1' bilden, wobei die Hauptbohle 13 und die im Raum 14 anzuordnenden Verstellbohlen, die in der Zeichnung nicht dargestellt sind, prinzipiell gleich aufgebaut sind.As can be seen from FIG. 1, the compaction screed 1 'has a so-called
In Fig. 1 ist mit gestrichelten Linien 2a angedeutet, daß die vordere erste Bodenplatte 2 um die Schwenkachse 11 in ihrer Neigung verstellt werden kann. Zur Verstellung des Verdichtungsbalkens 1 - und damit der vorderen ersten Bodenplatte 2 - ist eine Spindel 17 vorgesehen.In Fig. 1 it is indicated by
In Fig. 1 ist weiterhin mit gestrichelten Linien angedeutet, wie sich die Stampfelemente 5', 6' um die Schwenkachse 8 bewegen, wobei die Stampferaggregate 5, 6 bzw. deren Stampfelemente 5', 6' durch eine Exzenterwelle 16 angetrieben werden, die über ein Pleuel 15 mit der Lasche 9 des Hebels 7 verbunden sind.In Fig. 1 is also indicated by dashed lines how the ramming elements 5 ', 6' move about the
Weiterhin ist in Fig. 1 zu erkennen, daß dem Stampfelement 6' des zweiten Stampferaggregates 6 eine mit ihrer Unterseite 26 über die Unterseite 25 der ersten Bodenplatte 2 nach unten vorstehende, während des Verdichtungsbetriebes auf dem von dem Stampfelement 6' des zweiten Stampferaggregates 6 nachverdichteten Baustoff aufliegende zweite Bodenplatte 18 unmittelbar nachgeordnet ist. Es ist weiterhin aus Fig. 1 zu erkennen, daß das zweite Stampfelement 6' in seiner Auf- und Abwärtsbewegung bis auf die mit dem Baustoff 3 in Eingriff stehende Arbeitsfläche der hinteren zweiten Bodenplatte 18 hinuntergelangt.Furthermore, it can be seen in FIG. 1 that the
Auch die vordere erste Bodenplatte 2 ist in ihrer Neigung so verstellbar, daß ihr rückwärtiger Bereich bis auf das Niveau der Arbeitsfläche der hinteren zweiten Bodenplatte 18 absenkbar ist.The inclination of the front
Fig. 3 zeigt eine Variante gegenüber dem Ausführungsbeispiel gemäß Fig. 1, wobei zusätzlich zur Hauptbohle 13 eine Verstellbohle 14' vorgesehen ist. Die Ausführungsform der Hauptbohle 13 gemäß Fig. 3 unterscheidet sich von der Ausführungsform gemäß Fig. 1 lediglich durch eine andere Verstelleinrichtung für den Verdichtungsbalken 1, die bei diesem Ausführungsbeispiel statt einer Spindel 17 einen Arbeitszylinder 19 aufweist.FIG. 3 shows a variant compared to the exemplary embodiment according to FIG. 1, an adjusting
Fig. 4 zeigt einen Schnitt durch die Verdichtungsbohle gemäß Fig. 3 in Richtung der Schnittlinie IV-IV in Fig. 3 gesehen, allerdings nur eine Hälfte der Hauptbohle 13. An der linken Seite von Fig. 3 befindet sich die Mitte der Hauptbohle 13; hier setzt sich die Hauptbohle 13 tatsächlich nach links weiter fort.FIG. 4 shows a section through the compaction screed according to FIG. 3 in the direction of the section line IV-IV in FIG. 3, but only one half of the
Die Hauptbohle 13 könnte grundsätzlich jeglicher zuvor bereits beschriebener oder ähnlicher Ausgestaltung sein, wobei hier eine Hauptbohle 13 gemäß Fig. 3 dargestellt ist.The
Es ist zu erkennen, daß der Verdichtungsbalken 1 über Arbeitszylinder 19 verstellbar ist, ohne daß dabei auch die Stampferlagerung verändert wird, da der Verdichtungsbalken 1 über die Arbeitszylinder 19 relativ zu den Stampfern separat aufgehängt ist.It can be seen that the
Weiterhin ist erkennbar, wie die Exzenterwelle 16 und die Lasche 9 des Hebels 7 aufgebaut sind. Dabei ist insbesondere erkennbar, daß die Exzenterwelle 16 in dem Bereich, in dem sie vom Auge des Pleuels 15 umfaßt wird, exzentrisch ausgebildet ist, und daß zu dieser vorgegebenen Exzentrizität noch die Exzentrizität einer Lagerschale 21 hinzukommt, welche die Exzenterwelle 16 in diesem Bereich umschließt. Diese Lagerschale 21 ist um die Exzenterwelle 16 koaxial verdrehbar. Mit einer Scheibe 22 wird die eingestellte Exzentrizität fixiert.It can also be seen how the
Je nach Drehstellung der Exzenterwelle 16 und der Lagerschale 21 zueinander, addieren oder subtrahieren sich die Exzentrizitäten der Exzenterwelle 16 und der Lagerschale 21, so daß der von der Exzenterwelle 16 und der Lagerschale 21 gebildete Exzenter, der von dem Auge des Pleuels 15 umfaßt ist, in seiner Exzentrizität veränderbar ist, wobei eine Veränderung dieser Exzentrizität eine Veränderung des Stampferhubes der Stampfaggregate 5, 6 bzw. deren Stampfelemente 5', 6' bewirkt.Depending on the rotational position of the
Weiterhin ist in Fig. 4 eine Kupplung 23' angedeutet, durch welche die Exzenterwelle 16 aktiv rotierend angetrieben wird.Furthermore, a clutch 23 'is indicated in FIG. 4, through which the
Fig. 5 zeigt schließlich ein weiteres (drittes) Ausführungsbeispiel einer erfindungsgemäßen Verdichtungsbohle 1', die sich gegenüber den vorstehend beschriebenen Ausführungsbeispielen durch eine veränderte Ausführungsform ihrer Verstelleinrichtung auszeichnet, wobei in Fig. 5 die Verstelleinrichtung einen Ölmotor 20 mit einem Schneckengetriebe zeigt.5 finally shows a further (third) exemplary embodiment of a compaction screed 1 'according to the invention, which is distinguished from the exemplary embodiments described above by a modified embodiment of its adjusting device, the adjusting device in FIG. 5 being an
- 11
- VerdichtungsbalkenCompression bars
- 1'1'
- VerdichtungsbohleCompaction screed
- 22nd
- (vordere) erste Bodenplatte(front) first base plate
- 33rd
- Baustoff (= Einbaumaterial)Building material (= paving material)
- 44th
- Pfeil (Fahrtrichtung des Fertigers)Arrow (direction of travel of the paver)
- 55
- (vorderes) erstes Stampferaggregat(Front) first tamper unit
- 5'5 '
- Stampfelement (von 5)Ramming element (of 5)
- 5a5a
- Abschrägung (von 5)Bevel (of 5)
- 66
- (hinteres) zweites Stampferaggregat(rear) second tamper unit
- 6'6 '
- Stampfelement (von 6)Ramming element (of 6)
- 6a6a
- Abschrägung (von 6')Bevel (from 6 ')
- 77
- (zweiarmiger Kipp-)Hebel(two-armed toggle) lever
- 7a7a
- Hebelarm (an 5')Lever arm (at 5 ')
- 7b7b
- Hebelarm (an 6')Lever arm (at 6 ')
- 88th
- Schwenkachse (von 7)Swivel axis (of 7)
- 99
- LascheTab
- 1010th
- 1111
- SchwenkachseSwivel axis
- 1212th
- Pfeil (Schwenkrichtung)Arrow (swivel direction)
- 1313
- HauptbohleMain screed
- 1414
- Raumroom
- 14'14 '
- Verstellbohle (Fig. 3)Adjustable screed (Fig. 3)
- 1515
- PleuelConnecting rod
- 1616
- ExzenterwelleEccentric shaft
- 1717th
- Spindelspindle
- 1818th
- zweite Bodenplattesecond base plate
- 1919th
- ArbeitszylinderWorking cylinder
- 2020th
- Ölmotor (Fig. 5)Oil engine (Fig. 5)
- 2121
- LagerschaleBearing shell
- 2222
- Scheibedisc
- 2323
- Unterseite (von 5')Bottom (from 5 ')
- 23'23 '
- Kupplungclutch
- 2424th
- Niveau (von 25)Level (out of 25)
- 2525th
- Unterseite (von 2)Bottom (of 2)
- 2626
- Unterseite (von 18)Bottom (from 18)
- 2727
- Unterseite (von 6')Bottom (from 6 ')
- 2828
- Höhenniveau von 26Height level of 26
Claims (17)
- A compacting screen for a road finisher,a) comprising a first baseplate (2) acting flatly on the road material,b) which baseplate (2) (in the direction of travel (4) of the finisher)characterised in thatb1) is immediately preceded by a first compacting means (tamping unit) (5) comprising a first tamping element (5') in the form of a strip extending transversely of the direction of travel (4), the underside of the first tamping element (5') being periodically moved as far as the level (24) of the underside (25) of the first baseplate (2), andb2) is immediately followed by a second compacting means (tamping unit) (6) comprising a second tamping element (6') in the form of a strip extending transversely of the direction of travel (4), the underside (27) of said tamping element (6') being periodically moved as far as the level (28) of the underside (26) of the second baseplate (18), andb3) which is immediately followed by a second baseplate (18) the underside (26) of which projects down beyond the underside (25) of the first baseplate (2), the underside (25) of the first baseplate (2) being disposed higher than the underside (26) of the second baseplate (18) by an amount corresponding to the maximum (tamping) travel of the second tamping element (6'),
the tamping elements (5', 6') are interconnected via a two-arm (rocking) lever (7), each tamping element (5', 6') being connected to one of the two lever arms (7a, 7b) respectively and the lever (7) being drivable in oscillation about its mounting axis (8). - A compacting screen according to claim 1, characterised in that the tamping elements (5', 6') are driven in opposition to one another.
- A compacting screen according to claim 1 or 2, characterised in that the tamping units (5, 6) or their tamping elements (5', 6') are coupled together in terms of drive.
- A compacting screen according to any one of claims 1 to 3, characterised in that the lever arms (7a, 7b) connected to the tamping elements (5', 6') are of different lengths.
- A compacting screen according to claim 4, characterised in that the lever arm (7b) engaging the rear second tamping element (7') is shorter than the lever arm (7a) connected to the front first tamping element (5').
- A compacting screen according to one or more of the preceding claims, characterised in that the (tamper) travel of the tamping elements (5', 6') is variable.
- A compacting screen according to one or more of the preceding claims, characterised in that the tamping frequency of the tamping elements (5', 6') is variable.
- A compacting screen according to one or more of the preceding claims, characterised in that the tamper drive comprises a working cylinder (preferably a hydraulic cylinder) and a means for oscillatory excitation of its piston.
- A compacting screen according to one or more of claims 1 to 7, characterised in that the tamper drive comprises an eccentric (16, 21) which is driven in rotation and which acts on the lever (7) or the tamping elements (5', 6') via a connecting rod (15).
- A compacting screen according to claims 6 and 9, characterised in that the eccentricity of the eccentric (16, 21) is variable.
- A compacting screen according to one or more of the preceding claims, characterised in that at least a portion of the first baseplate (2) is controllably lowerable as far as the level (28) of the underside (26) of the second baseplate (18).
- A compacting screen according to claim 11, characterised in that the front first baseplate (2) is mounted to rock about an axis (11) extending transversely of the direction of travel (4).
- A compacting screen according to claim 11 or 12, characterised in that for its controlled lowering the front baseplate (2) is connected to an adjustment means comprising a worm drive.
- A compacting screen according to claim 12 or 13, characterised in that the radial distance of the front edge of the front first baseplate (2) from the rocking axis (11) is less than the distance of its rear edge.
- A compacting screen according to one or more of the preceding claims, characterised in that the tamping elements (5', 6') have bevelled front edges in manner known per se.
- A compacting screen according to claim 15, characterised in that the bevel (5a) of the front first tamping element (5') has a larger angle to the horizontal than the bevel (6a) of the rear second tamping element (6').
- A compacting screen according to one or more of the preceding claims, characterised in that the front baseplate (2) and the tamping units (5, 6) form an interchangeable unit.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT89119795T ATE100161T1 (en) | 1988-12-19 | 1989-10-25 | COMPACTION SCREED FOR A ROAD FINISHER. |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3842706 | 1988-12-19 | ||
DE3842706 | 1988-12-19 | ||
DE3933742 | 1989-10-10 | ||
DE3933742A DE3933742A1 (en) | 1988-12-19 | 1989-10-10 | COMPaction screed for a road paver |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0374428A1 EP0374428A1 (en) | 1990-06-27 |
EP0374428B1 true EP0374428B1 (en) | 1994-01-12 |
Family
ID=25875331
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89119795A Expired - Lifetime EP0374428B1 (en) | 1988-12-19 | 1989-10-25 | Compacting screen for a road finisher |
Country Status (6)
Country | Link |
---|---|
US (1) | US5165820A (en) |
EP (1) | EP0374428B1 (en) |
JP (1) | JP3056224B2 (en) |
DE (2) | DE3933742A1 (en) |
DK (1) | DK197290A (en) |
WO (1) | WO1990007030A1 (en) |
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US8371770B1 (en) | 2012-04-09 | 2013-02-12 | Caterpillar Inc. | Apparatus for tamping paving material |
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DE9313161U1 (en) * | 1993-09-01 | 1993-10-28 | Joseph Vögele AG, 68199 Mannheim | Pavers and tools |
DE19625006A1 (en) * | 1996-06-22 | 1998-01-15 | Abg Allg Baumaschinen Gmbh | Process for paving asphalt mix |
EP3375936B1 (en) * | 2009-11-20 | 2021-08-11 | Joseph Vögele AG | Paving screed for paver |
EP2325391B1 (en) * | 2009-11-20 | 2013-03-20 | Joseph Vögele AG | Tamper with variable stroke |
WO2015179988A1 (en) | 2014-05-26 | 2015-12-03 | Ammann Schweiz Ag | Method for converting a rotary movement into a translatory movement, use of same and device for carrying same out |
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US1644511A (en) * | 1921-12-29 | 1927-10-04 | Edward G Carr | Concrete-road machine |
US3252390A (en) * | 1963-04-02 | 1966-05-24 | Koehring Co | Concrete paving machine |
US3508475A (en) * | 1967-08-30 | 1970-04-28 | Barber Greene Co | Plate towed compactor |
US3541932A (en) * | 1967-12-18 | 1970-11-24 | Pape Bros Inc | Auger type aggregate spreader |
US3504598A (en) * | 1969-01-22 | 1970-04-07 | Rex Chainbelt Inc | Pulverizer-mixer with a vibratory tailboard |
US3614916A (en) * | 1970-04-13 | 1971-10-26 | Jewell R Benson | Compacting apparatus for finishing hot mix pavement |
US3856425A (en) * | 1971-01-04 | 1974-12-24 | Miller Formless Co Inc | Adjustable side for slip form |
DE3209989A1 (en) * | 1981-04-07 | 1983-09-29 | Joseph Vögele AG, 6800 Mannheim | Road-surface finisher |
DE3127377C2 (en) * | 1981-07-09 | 1985-05-02 | LIBA Lingener Baumaschinen Gesellschaft mbH & Co. KG, 4450 Lingen | Compaction screed for road pavers |
DE3500277A1 (en) * | 1985-01-05 | 1986-07-10 | Dynapac HOES GmbH, 2906 Wardenburg | Board arranged on the rear side of a road construction material laying machine, for finishing the surface of freshly laid road construction material |
US4828428A (en) * | 1987-10-23 | 1989-05-09 | Pav-Saver Manufacturing Company | Double tamping bar vibratory screed |
-
1989
- 1989-10-10 DE DE3933742A patent/DE3933742A1/en not_active Withdrawn
- 1989-10-25 US US07/566,369 patent/US5165820A/en not_active Expired - Fee Related
- 1989-10-25 DE DE89119795T patent/DE58906709D1/en not_active Expired - Fee Related
- 1989-10-25 EP EP89119795A patent/EP0374428B1/en not_active Expired - Lifetime
- 1989-10-25 WO PCT/DE1989/000682 patent/WO1990007030A1/en unknown
- 1989-10-25 JP JP1510960A patent/JP3056224B2/en not_active Expired - Lifetime
-
1990
- 1990-08-17 DK DK197290A patent/DK197290A/en not_active Application Discontinuation
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8371770B1 (en) | 2012-04-09 | 2013-02-12 | Caterpillar Inc. | Apparatus for tamping paving material |
Also Published As
Publication number | Publication date |
---|---|
JPH03503915A (en) | 1991-08-29 |
US5165820A (en) | 1992-11-24 |
DE3933742A1 (en) | 1990-06-21 |
DK197290D0 (en) | 1990-08-17 |
EP0374428A1 (en) | 1990-06-27 |
DK197290A (en) | 1990-08-17 |
JP3056224B2 (en) | 2000-06-26 |
DE58906709D1 (en) | 1994-02-24 |
WO1990007030A1 (en) | 1990-06-28 |
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